Climate issue - air to footwell

[mercconvert]

Hi Everyone, I'm not sure whether this should be under electronics or interior, so apologies if its in the wrong place.
My 2003 CLK seems to have a slightly odd issue. When the air is directed to the footwell on the drivers side, there isn't much air coming through, even with the blower turned right up. The passenger side is fine. It doesn't improve if the air setting is on windscreen & footwell or just footwell. I can't see a blockage at the vent exit. Has anyone else experienced similar and found out what was causing it? Thanks in advance

 

[Ted]

It might be worth replacing the cabin filter (just remove it to test it) and see if this resolves it.
Under a couple of clips above the battery.

 

[mercconvert]

Hi thanks

 

[mercconvert]

Hi thanks for the suggestion- I changed the internal filters in August and just tried running without - no change- I also tried your suggestion and removed the air con filter - no change

 

[lexman8]

Does your car have dual zone climate? If so, the flap within the climate unit that controls air to the driver's side footwell is stuck closed and/or malfunctioning.

Don't know about your car but on mine the flap is operated by a stepper motor controlled by the climate ECU.

 

[mercconvert]

Hi yes it is dual zone - I have the clicking behind the dash from the vents around the centre above the stereo - I'm now suspecting maybe this is related - I assume this would be a dash out job to fix either problem?

 

[lexman8]

The clicking sound almost always means a faulty flap. The footwell flap is accessible on some models without having to take the dash out.

Some of the possible faults:

• the flap is simply stuck
• the stepper motor is failing/jammed
• the stepper motor needs syncing

Stepper motor syncing is the easiest (but least likely) fix and can only be done with STAR. It always has to be done if the motor is removed or replaced.

On many MBs you can put the climate system in diagnostic mode and, amongst many other things, command each flap to move. This might be worth a try but I don't know how to do it on a CLK. On my car you press the REST and Recirculate buttons for >5 secs. I have a list of the diagnostic commands somewhere but again your car may be different. Perhaps Google something like 'Mercedes CLK climate diagnostic'.

 

[mercconvert]

That's extremely helpful
Thank you I'll start at the easy point

 

[mercconvert]

Hello
I tried a reset by holding down rest and windscreen Defog- the display started flashing and the left side displayed 0 whilst the right kept toggling between numbers generally between 9-12 but it seemed to show 10 the most - I waited around 3-4 minutes and it didn't finish so I switched off. Does anyone know if code 10 is giving me an indication of the fault, have I pressed the wrong buttons or is my car just having a climate benny? It's a w209 clk
Thanks in advance

 

[mercconvert]

I have this style of climate ( picture copyright of benzworld)

 

[lexman8]

Your system looks like an updated version of mine so these procedures for my car may help. Clearing codes is different to how you describe.

Access Diagnostic Trouble Codes (DTC) Procedure:
Ensure the starting position is with both ACC AUTO knobs pressed in (knob is inside, which means the system is in "Auto" function mode).
Press Residual Heat and Ventilation (REST) and Activated Charcoal Filter Buttons simultaneously for greater than 5 seconds with ignition on (position 2) or with engine running.

The ACC display screen shows "searching … ".
Then ACC display screen shows "DIAGN. ERROR ----"

Use the right increase/decrease temperature button to scroll up and down to see each fault/error code.

Fault Codes
B1000 Control unit N22 (AAC pushbutton module) is defective.
B1022 Fault in CAN communication w/ control unit ESA-FL (Electrically andjusted front left seat)
B1023 Fault in CAN communication w/ control unit ESA-FR (Electrically adjusted front right seat)
B1053 Fault in CAN......DCM-RR (Door control module rear right)
B1054 Fault in CAN......DCM-FR (Door control module front right)
B1055 Fault in CAN......DCM-FL (Door control module front left)
B1056 Fault in CAN......DCM-RL (Dorr control unit rear left)
B1057 Fault in CAN......OCP (Overhead Control Module)
B1059 Fault in CAN......SAM-FL (Front Left Signal Aquisition Module)
B1074 Fault in CAN......EIS (Electronic Ignition Switch)
B1075 Fault in CAN......SAM-FR(front right Signal Aquisition Module)
B1076 Fault in CAN REAR SAM (Rear Signal Aquisition Module)
B1087 Fault in CAN......TSTH (Stationary Heater)
B1088 Fault in CAN......ICM (Instrument Cluster Module)
B1219 N22b1 (In car temperature sensor)
B1228 B10/2 (Left heat exchanger temperature sensor)
B1229 B10/3 (Right heat exchanger temperature sensor)
B1230 B10/6 (Evaporator sensor)
B1241 Refrigerant Level is too low
B1256 B10/6 (Evaporator temperature sensor) Evaporator front
B1257 Refrigerant pressure is 0 bar
B1267 Communication Fault of A/C bus
B1268 Communication fault of A/C bus w/ control unit N18/4 (Center vents electronic control module)
B1269 Communication fault of A/C bus with control unit B31/1 (AAC multi function sensor)
B1270 Communication fault of A/C bus w/ control unit
B32/2 (AAC sun sensor (4 in total)
B1271 Communication fault of A/C bus w/ control unit N22/5 (Stepping motor electronics control module)
B1298 B10/6 (Evaporator temperature sensor), Evaporator rear)
B1417 A31y1 (left duo valve) Heater valve
B1418 A31y2 (right duo valve) Heater valve
B1424 A32m2 (activated charcoal filter flap adjustment motor)
B1434 Voltage supply of A/C bus
B1451 M16/17 Left center vent diverter flap actuator motor
B1452 M16/19 Left center vent temperature regulating flap actuator motor
B1453 M16/21 Fresh air and recirculated air flap actuator motor
B1455 M16/13 Left defroster nozzle flap actuator motor
B1456 M16/14 Right defroster nozzle flap actuator motor
B1457 M16/15 Left footwell flap actuator motor
B1458 M16/16 Right footwell flap actuator motor
B1463 M16/18 Right center vent diverter flap actuator motor
B1464 M16/20 Right center vent temperature regulating flap actuator motor.
B1849 Fault in CAN communication with control unit N22/4 rear A/C control unit

Press Residual Heat and Ventilation (REST) button to exit Menu.

Reset/Clear/Erase Diagnostic Trouble Codes (DTC) Procedure
Press Residual Heat and Ventilation (REST) and Activated Charcoal Filter Buttons simultaneously for greater than 5 seconds with ignition on (position 2) or with engine running.
The ACC display screen shows "searching … ".
Then ACC display screen shows "DIAGN. ERROR ----"
Use the Right Increase or Decrease Temperature Button to scroll up and down to see the fault/error codes.
To Reset/Clear/Erase a Fault/Error Code select the Fault Code then press out Left ACC AUTO Air Delivery Button (ie place Left AUTO Air Delivery button extended in Manual Mode) and then press out Right ACC AUTO Air Delivery Button (ie place Right AUTO Air Delivery button extended in Manual Mode).
Then press the left one in first, and then the right one in.
The display shows “errors deleted”.
Press Residual Heat and Ventilation (REST) button to exit Menu.
Turn ignition off, then back on again, and the ACC screen is reset and back to normal.

 

[mercconvert]

That's brilliant thank you I'll give it a go tomorrow

 

[mercconvert]

Thank you I tried that today but all I could get was numbers again it didn't show searching it just alternated between 00 in the left and 10 or 11 on the right.

 

[lexman8]

Sorry it hasn't worked for you.

The only other suggestions I can make are:

• try Googling to see if there's a different way to access the diagnostics on your car
• perhaps the climate ECU is faulty and that's why you're not seeing any codes. It may have to go on STAR for a more thorough analysis.

_

 

[mercconvert]

Hi All
The CLK went on the STAR machine today - I received the following:
B1021 - Component N22/4 (Rear blower electronic selector wheel) has short circuit or idle speed - note this fault can be ignored if no booster blower is installed
B1590 - Component A32m2 (Activated charcoal filter flap adjustment motor) is still or blocked
B1580 - Component M2/11 (Right footwell flap actuator) is still or blocked
B145 0 - B31 (C-ACC multifunction sensor)


I have the clicky dash so I know for that its the entire dash out, but in regards to the drivers footwell flap, does anyone know how easy or hard it is so get to the motor/flap?

Thanks in advance

 

[mercconvert]

sorry that should be B15B0 not B1580

If anyone has experienced issues with their footwell flap actuator I would appreciate your input on how you resolved it. Thanks

 

[ShaunB]

Yep, I had.

I resolved it by taking to an independent specialist who fixed it by replacing replacing some motor - £130.

 

[mercconvert]

Wow you got away lightly then - my quotes are between £600-£1000
I've started tearing the car apart a bit more and can now see the motor with the clicking arm- I've purchased the repair kit from merc and just need to get the stepper motor out - I'll post instructions and pictures when I'm done in case it will be of help anyone else

 

[mercconvert]

And the stepper motor saga continues I think I can now see it , you'll see in the pictures I believe it's the item with the text on it but a major structural bar that comes from the top of the car (on right) towards the centre console the bottom is blocking all four screws which holds it in, does anyone know how to get past the bar I don't really want to remove it perhaps drilling through it to make access holes for screws ?

 

[mercconvert]

So somehow, after 2 hours of fighting with Herman (the German ), I managed to remove the 3 screws holding the motor in. 'Success!' I thought -
Motor out I'm half way there - except I'm not because running the motor disconnected from the plastic arm results in it running quite smoothly - therefore implying the motor is fine and I need to figure out how to get to the plastic cogs which are apparently worn but awol in the dash somewhere! Of course this would all be in process as my spare car decided to blow up yesterday - such fun!

As always if anyone has any info on how to get to the offending air flap cogs please let me know.

In the mean time I shall option the same policy with the merc that I have with Microsoft - I will not be beaten !
Thanks